Method for producing Nb-Sn compound superconducting wire precursor and wire

摘要

A method of producing an Nb-Sn compound superconducting wire precursor includes forming composite filament materials, each filament including a niobium material of an Nb-based metal and a titanium material of pure Ti enveloped in the niobium material; forming a composite rod in which composite filament materials are arranged in a matrix of a Cu-based metal but not in contact with one another, the matrix containing Sn diffused by heat treatment to combine with the niobium material to form a compound; and drawing the composite rod.